Particle-Based Numerical Manifold Method to Model Dynamic Fracture Process in Rock Blasting
Publication: International Journal of Geomechanics
Volume 17, Issue 5
Abstract
A particle-based numerical manifold method (PNMM) is developed to investigate rock fracturing behavior under dynamic loading. The basic idea of PNMM is to represent the microstructure of rock with a group of particles and to simulate the macroscopic behavior of rock masses through polygonal elements, which is performed by a dual-level discretization system. The first discretization is in the manner of FEM, which reduces the infinite degrees of freedom (DOF) of a continuum to the finite DOF of polygonal elements. However, the DOF of the model are not further affected by the latter discretization. The behaviors of internal particles are obtained from the mechanical fields of their governing elements. A dual-layer-cover system, i.e., the mathematical cover and the physical cover, is adopted in PNMM. Fracture initiation and propagation at a macroscopic level are represented as the coalescence of microcracks induced at the microscale level between particles. The Johnson-Holmquist-Beissel (JHB) model is incorporated into PNMM to simulate a borehole blasting under dynamic loading conditions. Numerical simulations show a good agreement with experimental and numerical results in the literature.
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Acknowledgments
This work is financially supported by the China Scholarship Council and LMR-ENAC-EPFL. The authors also appreciate the help on the visualization of PNMM provided by Professor Chun’an Tang at Dalian University of Technology.
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International Journal of Geomechanics
Volume 17 • Issue 5 • May 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Sep 22, 2015
Accepted: May 27, 2016
Published online: Aug 17, 2016
Discussion open until: Jan 17, 2017
Published in print: May 1, 2017
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